Improvement in scroll-sawing machines



V L-HALE. Scroll-Sawing Machine.

$10,160,768, Patented March16,1875.

THE GRAPHIG C0.PHOTD.-LITH.39&4Y PARK PLAG JtY.

UNITED STATES PATENT OFFICE.

JOSEPH HALE, OF SOMERVILLE, MASSACHUSETTS.

IMPROVEMENT IN SCROLL-SAWING MACHINES.

Specification forming part of Letters Patent No. 160,768., dated March16, 1875 application filed March 20, 1874.

slides working in fixed grooves, said slides serving to hold the saw,and thus directing its motion; also, in arranging one of the slides sothat it may be strained up to make the saw taut.

The drawing represents the invention in elevation.

Let S represent the driving-wheel, from which a band connects with thecrank-disks K. On this crank-disk I place a crank-pin, m, which, workingthrough a slot, L L, in the arm E, operates said arm. The arm E isconnected by a link, H, to the upper arm D, so that the arms E and Dmust operate together.- A and A is a fixed frame, made as shown.

In the extremities of. the arms of this fixed frame I hang the slides PP, which Work in fixed grooves. These slides P I? hold the ends of thesaw, and are attached to the oscillating arms E and D by the links R andR, as shown, so that the saw may have a perfectly vertical motion. Theupper link R is connected to an adjustable rod, T, which is held at thedesired point by the set-nut T.

The advantage that I claim for my invention is that I get a perfectlyvertical motion by a very simple and cheap device.

I claim as my invention- In a fret-saw, the combination of the crank KM, slotted arm E, link H, and arm D with the links E R, slides P P, andadjusting-rod T, all constructed and operating together, substantiallyas described, and for the purpose set forth.

JOSEPH HALE.

Witnesses:

FRANK G. PARKER, WILLIAM EDsoN.

